Method of casting concrete shingles



July 17, 1951 c. F. SCHAAF 2,560,781

' METHOD QF CASTING CONCRETE SHINGLES Filed Sept. 10, 1947 ATTORNEY Patented July 17, 1951 METHOD OF CASTING CONCRETE SHINGLES Cecil F. Schaaf, Flint, Mich.

Application September 10, 1947, Serial No. 773,108

2 Claims. 1

This invention is a method for casting cement shingles or asbestos cement shingles such as are used on the roofs and side walls of buildings in general.

One of the prime objects of the invention is a method of manufacture, which provides for low cost, and which lends itself to quantity production without the necessity of skilled labor, and with a minimum of mechanical equipment.

One of the prime objects of the invention is to provide a shingle and method of manufacturing in which the finished shingles are of uniform, accurate dimensions, and which can be easily and quickly removed from the form when cured.

With the above and other objects in view, the present invention consists in the method, hereinafter more fully described, illustrated in the accompanying drawings, and more particularly pointed out in the appended claims, it being understood that changes may be made in the form, size, proportion, and minor details of construction, without departing from the spirit, or sacrificing any of the advantages of the invention.

In the drawing:

Fig. 1 is a top, plan View showing the metal mold plate formed to shape.

Fig. 2 is a view showing the plate in position in the mold, and the cementitious aggregate therein.

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2.

Fig. 4 is a perspective view of one of the precast shingles.

Referring now to the drawing in which I have shown the preferred embodiment of my invention. The letter M indicates a mold box which can be formed of metal or any other desired material. This box is preferably formed in two sections 6 and 1 respectively, flanged as at 8, and bolts 9 are provided for securing the sections together, these sections being mounted on a base plate or pallet B in the usual manner.

The mold plate 10 is formed of a single strip of metal as clearly shown in Fig. 1 of the drawing, and is bent to form a plurality of compartments ll, each compartment being closed at one end and open at the other, these open ends being disposed in staggered relation; that is, the open end of one compartment faces in one direction, while the open portion of the next compartment faces in the opposite direction.

A beaded section 12 is provided in the metal in the closed end wall of each compartment, and a reinforcing strip I4 is inserted in each compartment with the one end of the strip centered in said bead.

The opposite end of the strip I4 is disposed in the open end of the compartment, and when the mold plate is collapsed in the mold box, the free end of the reinforcing strip is held between the butt ends of the closed sections, as the open ends of these compartments are readily collapsible in much the same manner as an accordion, so that the reinforcing strip is accurately centered and as clearl shown in Fig. 2 of the drawing.

After the mold plate has been assembled in the mold box, a neat aggregate N consisting of sand, cement, and/or other lightweight material is placed in said mold box to completely fill the compartments; the face of the mold box is then struck off after which the mold box is vibrated to provide a closely packed dense body with no voids, after which the mold is placed in a curing chamber for curing.

After the shingles have been sufficiently cured, the bolts 9 are loosened, and the mold box sections are removed so that the individual shingles S can be readily removed by expansion of the mold plate, each shingle having a rib IE on the butt end as shown.

The mold plate can be of any desired size and capacity and can be used over and over again.

From the foregoing description, it will be obvious that I have perfected a very simple, practical, and economical shingle and method of manufacture, which can be readily practiced, and which requires very little equipment and floor space.

What I claim is:

1. A method of casting pre-cast shingles which consists in providing a sheet metal plate to provide a plurality of compartments, the end walls of which are alternately open and closed, providing a bead in the closed end wall of each compartment, inserting one end of a reinforcing sheet therein, pressing the compartments toward each other to close the open ends and grip the sheet therebetween, then filling said compartments with a cementitious aggregate to form a plurality of pre-cast shingles, and then releasing said pressing means after the cementitious aggregate has set.

2. A method of casting pre-cast shingles, which consists in providing a sheet metal mold plate formed to provide a plurality of compartments, the end walls of which are alternately open and closed, providing a centrally disposed bead in the closed end wall of each compartment placing the mold plate in a mold box, placing a reinforcing sheet in each compartment with the one end in said bead, collapsing the mold plate to close the open ends of the compartments and grip the 3 opposite ends of the sheets therebetween then filling said mold box with a cementitious aggregate, and then releasing the collapsed plate after the cementitious aggregate has set.

CECIL F. SCI-IAAF.

REFERENCES CITED The following references are of record in the file of this patent:

Number UNITED STATES PATENTS Name Date Katz Mar. 1, 1898 Gosnell Feb. 10, 1914 Sivertson Oct. 3, 1922 Amele July 13, 1926 Pedersen May 27, 1930 Walter Feb. 23, 1932 Buczkowski Sept. 28, 1937 Rafferty Dec. 27, 1949 

